Update lib.rs

Author: JunkuiZhang

notify/src/lib.rs

@@ -460,7 +460,7 @@ mod tests {
         fs::create_dir(&child_dir)?;
 
         let mut watcher = recommended_watcher(|e| {
-            println!("{:?}", e);
+            // Do something here.
         })?;
         watcher.watch(&child_dir, RecursiveMode::NonRecursive)?;